I've implemented some new vB codes with various uses, [collapse],[tab], and [tabset]. I've tested them with firefox and IE and thay seem to be working fine, with the exception that you have to mouseover quickreply and quickedit posts to activate them and they have interaction problems if you nest them. You can find out the details at http://zelaron.com/forum/misc.php?do=bbcode
I just added some stuff to the code so you wouldn't have to. The problem is that everything is absolute positioned and 100% width. It works fine on a cell that already has width, but if it's the only thing in a cell, it does what you saw.